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BUG: KCSAN: data-race in file_update_time / inode_update_timestamps

write to 0xffff88815b2892a0 of 8 bytes by task 9696 on cpu 0:
 inode_set_ctime_to_ts include/linux/fs.h:1601 [inline]
 inode_set_ctime include/linux/fs.h:1619 [inline]
 inode_set_ctime_current fs/inode.c:2512 [inline]
 inode_update_timestamps+0xb5/0x280 fs/inode.c:1859
 generic_update_time fs/inode.c:1898 [inline]
 inode_update_time fs/inode.c:1918 [inline]
 __file_update_time fs/inode.c:2106 [inline]
 file_update_time+0x229/0x2b0 fs/inode.c:2136
 fault_dirty_shared_page+0xde/0x2d0 mm/memory.c:3008
 do_shared_fault mm/memory.c:4826 [inline]
 do_fault mm/memory.c:4872 [inline]
 do_pte_missing mm/memory.c:3745 [inline]
 handle_pte_fault mm/memory.c:5144 [inline]
 __handle_mm_fault mm/memory.c:5285 [inline]
 handle_mm_fault+0x13a6/0x27c0 mm/memory.c:5450
 do_user_addr_fault arch/x86/mm/fault.c:1364 [inline]
 handle_page_fault arch/x86/mm/fault.c:1507 [inline]
 exc_page_fault+0x401/0x6d0 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

read to 0xffff88815b2892a0 of 8 bytes by task 9700 on cpu 1:
 inode_get_ctime include/linux/fs.h:1595 [inline]
 inode_needs_update_time fs/inode.c:2089 [inline]
 file_update_time+0x107/0x2b0 fs/inode.c:2132
 fault_dirty_shared_page+0xde/0x2d0 mm/memory.c:3008
 do_shared_fault mm/memory.c:4826 [inline]
 do_fault mm/memory.c:4872 [inline]
 do_pte_missing mm/memory.c:3745 [inline]
 handle_pte_fault mm/memory.c:5144 [inline]
 __handle_mm_fault mm/memory.c:5285 [inline]
 handle_mm_fault+0x13a6/0x27c0 mm/memory.c:5450
 faultin_page mm/gup.c:958 [inline]
 __get_user_pages+0x402/0xe40 mm/gup.c:1241
 faultin_vma_page_range+0x7e/0xa0 mm/gup.c:1737
 madvise_populate mm/madvise.c:929 [inline]
 madvise_vma_behavior mm/madvise.c:1038 [inline]
 madvise_walk_vmas mm/madvise.c:1260 [inline]
 do_madvise+0x90b/0x25e0 mm/madvise.c:1440
 __do_sys_madvise mm/madvise.c:1453 [inline]
 __se_sys_madvise mm/madvise.c:1451 [inline]
 __x64_sys_madvise+0x60/0x70 mm/madvise.c:1451
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x000000002fd5dc8f -> 0x00000000306e730f

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9700 Comm: syz-executor.1 Not tainted 6.8.0-rc2-syzkaller-00199-g021533194476 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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